Machine for grinding springs



Feb. 26, 1935. H. P TROEND| Y 1,992,452

MACHINE FOB GRINDING SPRINGS Filed June 16, 1930 5 sheets-sheet 1 INVENTOR B Harp' P Troenj 1)! ATTORN EYS Feb. 26, 1935.. H r l TRQEND-LY 1,992,452

MACHINE FOR GRINDING SPRINGS Filed June 16, 950 3 Sheets-Sheet 2 lq O H "l "l I A INVENTOR ATTORNEYS Feb. 26, 1935. H. P. TROENDLY MACHINE FOR GRINDING SPRINGS Filed June 16, 1950 3 Sheets-Sheet 5 INVENTOR A BY Hdrrj pmmdi] @www M ATTORNEYS Patented Feb. 2 6, 1935 `11,992,452 v MACHINES Fon YGRINDING,sal-lentosy iHarrys. Troenaiy, unicam-n1., assigner-taiwan? 'Gibson' Co., (lhicago, l111.-,-r vxa. "corporationof .Illinois j "Aplilifiin 16, 1931, serial 10.461.352

' 9 Claims. f :(0'1, .5l-.118).

Tbis'inventionrelates to .a Ina-chine forggrinding `Springs; :it is concerned particularly with .a machine forfgrinding the-ends of :coil .springs so that they are more readilyadapted to seat:.on1a

surface. A

There are .quite a number ofrimportantfeatures .of yconstruction .in the :machine which will be more rea'dily -appreciated from .the :following detaileddescription. However, itimay be pointed out that the :invention is concerned .with a machine provided preferably with two sets :or Ypairs of grinding Wheels together with suitableholding devices;andadjustablefmechanism soithat the sets may l.be moved as required, simultaneously or individually. The'machine isconstructed s othat springs to begroundlmayrbe fed .intonthe :machine fromV both -sides thereof; in other words, ithe machinegis of vduplex-or double formation soythat there Vmay-beam operatonat feachfside-of the imachine. In the -form of machineshown, however, the :springs fed :from both sides of 4:theirnachine willbe actedfupontby the same. .grinding elements; it -is to be appreciated, fhowever, that :the machine may -be -operatedavhen springs are being fed but from one side. Other features ,comprise v.the mounting of the `spring carrier-so thatit can be properly .adjusted on the center lline ror toward and away from :the machine 4as `required, and also guide means fare associated with the spring carrier so that springs aregproperly positioned as they enter-between thefgrinding elements; .also exhaustportsfbothebove and below, are provided for carrying away thedust.

The Igrindingwheels -must needs vbe dressed from time to time, and the present invention affords means -for `doing this `.with -the grinding wheels in situ.

Fig. f1 is a sideselevation of Vthe machine, illustrating however, some of -the parts, ,including the grinding wheelsinfsection, withf-the. .grinding wheels withdrawn from the center housing in .which the grinding action' :takes place.

Fig. .2 is angzend :elevation thereof.-

., Fig. Bfisian emerged-section taken'- on line `3 3 of-1ig.'1r showing the spring carrier and grinding wheels. v y

Fig.- 4-.is`.a'ssectionalview taken substantially online 4-7-4 of Fig'. `2 showing the structure-fior dressing the grinding wheels. v

Fig. 5 is a sectional view taken onwline ;.5--5 .of,l5?ig.4. Y

- `vEig.A 6 is ran enlarged 'viewfin rillnstration ofr slome `'ofthe.adjusting:parts` Y y Fig. 'lis a-view illustrating theposition ofthe parts as :seen .from `.the right :hand noij- Eig; 6. l

Figszand -9 zare :somewhat diagrammatical in form ,fillustrating the Ispring carrier driver mech-' aIlSm. ,The machine comprises a'suitable base lgsituated substantially Centrally-'on which :is 1 a housing 2 openaat lits sides through which the grinding wheels are movable. .The :grinding action taires place :in this .housing and Ethe same eis 4provided rwithfenhaust ports 3 ,and 4g, one above and .one be1ow,^':and suitablemeans (not shown) .are employed -for ,effecting :a `our-rent l of vfair out of these 'exhaust :ports ,thus tofcarry :away the aparticlesincident to theigrinding action. Thezgrindng wheels A.arranged in Opposed pairs, one-pair being illustrated at ;5 l,and 6, and the :other pair-at?? and f8. The grinding wheel :5 is ,carried .fby :a .shaft `(not cshown) f journaledy in suitable `housing V10 driven yby 4a. motor 1'1. The wheel 7 Ais' similarlyrmountedion la .shaft {(not shown) l ourinaled iin housing s12 driven by emotoi' 173. The wheels and 8.are similarly mounted. K

'llhegrindingjwheels and v'7 .togetherwith their associated elementsv Icomprise a Iunit movable bodily in tmand ...outgof theghousingZ; thatzislto say, the wheels 5 and1'7 rare movable' into andnut Vci ,the .housing ',{Ihe base i1.- has :asuppportpl uponfwhichisslidably mountedfa supporting table l1.6 which oarriesithe 4wheel .7,vits. motor andshaft; y g

Above f the `motor "13 :is `a. :support :1;'7 upon which table :18 -fori-,the fmotor 1 -1- and -wheel;5;is -sldably mounted. @Support L7 A:isycaz-'ried by; support 16 fby suitable standards la. 'The'table 18imaybe slidably adjusted onthe support f1.7; vand :for this Y purpose ascrew f1=9 :is threaded intorthesamefhayl nga1sguarefend A20 `for the reception f of a'tool, and v'agauger21-1 The sorewdsheldstationary to the-support 417,-;asloy means of aibracket so that whenfthe screw 2.0 :isrotatedwthe table .18 and :allgof- :the parts supported thereby, -to-witzl Awheela'r, lits journalim0untingf10iandn1otor 51:1 are. fed toward and awayy trom-the :housing 2. The :corresponding parts qonothe :other :side of-the machine, fnamely, -the wheel `6 and'nits associated elements are similarlyimountediand fduplicate descriptionfis notnecessary.; 5: zk Also-,\-the '.wheel 8 andrits :..assooiatedfxpartsrare mounted for reciprocable adjustmentilikewheel .'yandiits Vassociated parts` yso 1,tlflat :redescription .ofrthisfneednotbamade.' :In :Egwthestructure fwhichinterconneots .the .units ,on `iezviclgl'fside V.of the machine for adjust'- -ment :purposes is slliowfn;Y The tw'ossupports', nr

1rather tables'fliifare .fintereonnedted;V there :is a

4distante rod 25 ,iixedlywseouredgfto .fone1tabl`e;16, f as at :26, '.-andfscrew threaded zat .its foppositend on the rod is a bevel gear 28 meshing with which is a pinion 29 having a projecting shaft shaped as-at 30 for the reception of a suitable tool such as a crank. 'Ihe bevel gear28, while rotatable, is carried by one table 16, for examplethrough the means of a sleeve like element 31. A distance rod 32 is connected at-one end to one table and the other has a rack 33. A rack 34 is carried by the other of the tables. Both of these racks mesh with an idler gear 35. Mounted on the shaft with the idler 35 is another and larger gear 36 meshing with pinion 37, having an operable shaft 38. A suitable eccentric 39 rotatably adjustable by shaft 40 underliesfthe end'of the distance rod 32 and holds it in mesh with gear 35.

By manually rotating the part 30 through the means of a suitable crank or the like; the bevel gear 28 is fed along the shaft 25 thus spreading or drawing' nearer to each othervthetables `16. The stop 27 Ymay be positioned to determine the normal distance between the grinding wheels for operation on a spring of a given size so that the two tables 16 may be separated for any purpose, as will later appear and may be returned to normal position determined by the stop 27.

Inasmuch as both tables'are slidable, means are provided to impart uniform movement to each table in such manner as to prevent one table from sticking, and Y. all movement taking place in one table. This is accomplished by the gear and rack arrangement above described.l In making an adjustment the gear 35 rotates, and in so doing imparts uniform reciprocable movement to both the racks 34 and 33 so that the total amount of adjusment is equally divided between the twohalves of the-machine.` It may sometimes be desirable to quickly open a machine, and by opening, I mean withdrawing the grinding wheels from the housing 2, as shown in Fig. 2, and `to do this the shaft 38 may be rotated; it will 'be appreciated that this results in a faster adjusting action than an adjusting action through the threaded rod 25.

Accordingly, it will be noted that by a single adjustment `the two pairs' of opposing grinding Wheels and their `associated elements may be withdrawn from the housing 2, or may be adjustable into the housing for grinding purposes; that, furthermore, the wheelsv and 6 are independently'and separately adjustable.

The springs which are ground are carried by what are termed Ferris wheels 35, one mountedon each side of the machine, and each having a pluralityrof openings 136 in which the springs are placed, one springto each opening. These wheels are suitably journaled and in their 'rotationcarry the springs in` between grinding wheels, as illustrated in Fig. 3. Preferably, the machine is provided with inclined wings 87 and v88 which engage the ends of the springs so as to center them. An operator stands on each side of the. `machine and keeps the holes 36 filled with springs; each time the operator pushes in a new spring, a finished springis pushed out.

'Ihe Ferris wheel'attachment is so lmounted that it is capable of quick adjustment as regards the vcenter line of the machine, ortowards and away from the axis. In this-regard both sides of the 'machine arev similar1so that only yone need be described. Supporting brackets 44 are employed having'a sort of table 41 near the top whichcarries a base "42fupon 4which bracket 43 $1,999,452 having an adjustable stop 27 thereon. Threaded is mounted. The Ferris wheel is journaled in the bracket as shown. The base 42 is adjustable toward and away from the machine. This is accomplished by providing the table 41 with a rack 45 and mounting a gear 46 onthe base 42, rotatable by applying a tool to the end of its shaft, as illustrated at 47. It will readily be seen that by turning the -part 47 the base 42 is moved along the table 41. Thus the Ferris wheel supporting structure is easily withdrawn to permit change of wheels to accommodate for the different sizes of springs. The bracket 43 is slidably carried on base 42, as by means of ways 48, and bracket 43 has-a gear 49 turnable by engagement with par't50, and the gear 49 meshes with rack 51. Thus the wheel is'quickly adjustable to the center line- After adjustment is made, the parts are then securely held in position by clamping screws 52 and 53.

The wheels are driven and this may beaccomplished by means of a belt 60 running over pulley 6l, which in turn is connected tothe wheels through the gear reducing Vworms and worm gears shown invFigs.'8 Vand 9. Preferably, the wheels are separately driven, as indicated by the belts 60 and 60a"(Fg. 2) so that only one wheel may be operated if desired. Obviously, a very small amount of power is required to drive the wheels, especially inasmuch .as there is a great gear reduction and the wheels move relatively slowly. y

Dresser units are provided for dressing each pair of grinder wheels. For the upper pair there is a unit generally illustrated at 70. This is shown in more detail in Fig.f4 wherein the unit is shown 'as comprising'a holding block 71 mounted on'a screw 72 rotatable by'a wheel 73. By this construction the holding block may be moved axially as regards the machine vto center it. A- guideway device 75 is carried by the holding block, and journaled therein is a shaft 76 having a hand wheely 77 on one end and a gear 78 on the other. A slidable device 80v is carried by guideway 75, and it has a rack 81 which meshes with a gear 78.v

`To dress the wheels a suitable dresser' (not shown) is carried by the device 80 and through the means of rotating theV wheel 77 it is fed down into the space between the wheels 6 and 5. It will be understood that the wheels 6 and 5 may be opened up somewhat at this time. The lower wheels may be dressed by a similar dressing unit generally referenced 82 and comprising, generally, the same details of construction as Athe one just described; in this regard it has a hand wheel 77a, and a centering wheel'73a, and other similar associated parts.

Accordingly, it will be vnoted that a' machine advantageous from a number of standpoints,` is provided. In operation, its output is'doubled because springs may be fed from both sides; The use of the two' sets of grinding wheels makes it possible to have one set first accomplish a rough grinding job and the other set a finishing job. A nicety of adjustment is providedythisresults not only because each side unit may be adjusted in and out, but because the individual wheels thereof may be adjusted with respect to each other. Y

1. A spring grinding machine compri"n`g a base, superimposed grinding wheels each having its own motor, means for adjusting simu'ltane` adjustingv individually one wheel and its motor axially, and another set of superimposed wheels substantially similar to the above mentioned superimposed wheels and disposed in opposing relation to the said described wheels.

2. A spring grinding machine comprising opposed grinding wheels, a rotatable spring carrying wheel for carrying springs between the opposed grinder wheels, means for supporting the spring carrying wheel, means for adjusting the support in an axial direction'for centering the carrying wheel, and means for moving the support perpendicular to the axis for removing the spring carrying wheel from between the grinder wheels.

3. A spring grinding machine comprising opposed grinding wheels, a rotary wheel for carrying springs between the grinder wheels, a bracket for supporting the spring carrying wheel, a gear and rack for adjusting the bracket axially, a table for the support, and a gear and rack for moving the table substantially perpendicular to the axis for removing the spring carrying wheel from between the grinder wheels.

4. A spring grinding machine comprising in combination, a support, a housing positioned substantially centrally on the support having its opposite sides open, a pair of grinding wheels on the support positioned on one side of the housing, another pair of grinding wheels on the support positioned on the other side of the housing, a motor for each grinding wheel, guideways upon which each grinding wheel and its motor are mounted, means for shifting the two grinding wheels on either side of the housing to retract them out of the housing through the open side thereof and for positioning the grinding wheels in the housing through the open sides thereof, and means for moving one of the two grinding wheels on either side of the housing axially relative to the other.

5. A grinding machine, comprising means for moving pieces of work to be ground, a plurality of pairs of axially spaced rotary grinding wheels with the wheels of each pair disposed on opposite sides of the work and adapted to grind the same, a driving motor for each grinding wheel, the axes of the grinding wheels being disposed substantially transverse tothe plane of movement of the work, a movably mounted support for each grinding wheel and its motor, means for simultaneously moving axially the supports with their grinding wheels and motors, and other means for moving axially one support with its motor and grinding wheel with respect to the other supports, their motors and grinding wheels.

6. A grinding machine, comprising means for moving pieces of work to be ground, a plurality of rotary grinding wheels positioned on one side of the work, the movement of the work being in a plane substantially transverse to the axes of said grinding wheels, means for simultaneously moving the said grinding Wheels axially, means for independently moving one grinding wheel axially, a plurality of grinding wheels positioned on the opposite side of the Work, the movement of the work being in a plane substantially transverse to the axes of said second mentioned grinding wheels, means for simultaneously moving the said second mentioned grinding wheels axially, and means for independently moving one of the said second mentioned grinding Wheels axially.

7. A grinding machine, comprising a rotary work carrier, a plurality of rotary grinding wheels grouped on one side of the carrier, theaxes ofthe grinding wheels substantially paralleling the axis of the carrier, a plurality of grinding Wheels grouped on the opposite side ofthe carrier, the axes of the second mentioned group of grinding wheels substantially paralleling the axis of the carrier, means for moving simultaneously all of said grinding wheels relative to the carrier with movement in the direction of the extent of their axes, means for moving one grinding wheel of the lrst mentioned group axially independently of other grinding wheels, and means for moving one grinding wheel of the second mentioned group axially independently of other grinding Wheels.

8. A grinding machine, comprising means for moving work to be ground, a plurality of vrotary grinding wheels on one side of the Work, a plurality of rotary grinding wheels on the opposite side of the work, a driving motor for each grinding wheel, the axes of the grinding wheels being disposed substantially transverse to the plane of movement of the work, means for simultaneously moving axially all ofthe grinding wheels on one side of the work and all of the grinding Wheels on the opposite side of the work, and other means for moving and positioning axially one grinding wheel on one side of the work with respect tothe other grinding wheels.

9. A grinding machine, comprising means for moving work to be ground, a plurality of rotary grinding wheels on one side of the work, a plurality of rotary grinding wheels on the opposite side of the work, a driving motor for each grinding wheel, the axes ofthe grinding wheels being disposed substantially transverse to the plane of movement of the work, a movably mounted support for each grinding wheel and its motor, means for simultaneously moving axially all ofthe sup-` ports with their grinding wheels and motors, and other means for moving and positioning axially 1 one support with its motor and grindingwheel with respect to the other supports, their motors and grinding wheels.

HARRY P. TROENDLY. 

